How hard is the water in Middlesex County, CT?
3 grains per gallon
You do not need a softener here.
The median hardness measured in Middlesex County, CT is 52 mg/L as calcium carbonate, which is 3 gpg. That is soft on the USGS scale. It comes from 15 samples at 6 sites between 1990 and 2023, drawn from groundwater wells, which is what most taps and private wells in the county draw on.
How much it varies here
Half the sites came in between 1.1 and 7.4 gpg. That spread crosses a decision line, so some homes here land on a different answer. A $10 test strip on your own tap settles it. Confidence in the county figure: medium (how it is measured).
What to do next
You can skip the softener. At 3 gpg the most a softener would fix is the odd water spot. If a salesperson in Middlesex County says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Middlesex County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on when a softener is not worth it.
From 0.7 to 13.8 gpg
The softest single sample on record in Middlesex County was 12.8 mg/L and the hardest 237 mg/L, a 19-fold gap. The top quarter of sites read above 7.4 gpg and the bottom quarter below 1.1 gpg. So even in a soft county, a handful of wells here produce water hard enough to scale a heater.
Wells 3 gpg, rivers and lakes 2.2 gpg
15 groundwater samples from 6 wells put the median at 51.8 mg/L. 481 surface samples from 8 sites put it at 36.9 mg/L. In Middlesex County the wells come out 0.8 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. The two sources are close, so the county figure should hold whichever one your tap is on.
Middlesex County against the rest of Connecticut
Among the 8 Connecticut counties with data, Middlesex County is number 6 of 8 counting from the hardest. Across the whole country it is harder than 22% of counties.
Softest in Connecticut: New London County at 2.3 gpg. Hardest: New Haven County at 6.1 gpg. Closest to Middlesex County: Fairfield County (3), New London County (2.3), Windham County (3.9).